Man, Trespasser is an example of a game with some pretty wild ideas about immersion and puzzle solving in a first person shooter game that the tech just wasn’t quite able to pull off. If anyone is curious there is a positively antique Let’s Play on YouTube that discusses the game’s development, its relation to the wider Jurassic Park franchise, cut content, and, of course, the game in context. I think it may have come from the old Something Awful forums, and it remains, to my mind, the gold standard for what I’d like Let’s Plays to be. Worth checking out if you’ve the time.
Further context, assuming the ruleset governing the OG Baldurs Gate games was true to the tabletop (I know they sort of kludged AD&D and aspects of 3e together). As the above said, a dual classed human “retires” their original class, and then begins to advance in their new class, essentially starting over from level 1, with only the hit dice and HP of their original class rolled over (you cannot access any of the class abilities you learned while advancing your original class). However, once your new class level is superior to your original class level, you can now access both skill sets.
It’s a very strange system, and I am curious what the fluff reasons surrounding it are, if anyone has any insight into that edition.